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The B/H ratio is not constant for ________
Non-magnetic materials
Paramagnetic materials
Ferromagnetic materials
Diamagnetic materials
Ferromagnetic materials
The B/H ratio represents the permeability of a material, denoted as ╬╝=B/H. For ferromagnetic materials, this ratio is non-linear and depends on the magnetic field intensity (H) due to the presence of magnetic domains, leading to the B-H hysteresis curve.
The B/H ratio represents the permeability of a material, denoted as ╬╝=B/H. For ferromagnetic materials, this ratio is non-linear and depends on the magnetic field intensity (H) due to the presence of magnetic domains, leading to the B-H hysteresis curve.
B=╬╝H тАФ Relation between flux density and field intensity
╬╝rтАЛ=╬╝0тАЛ╬╝тАЛ тАФ Relative permeability
In ferromagnetic materials, individual magnetic domains align with an external field, creating non-linear magnetization ┬╖ AsH increases, the material reaches a state of saturation, causing the permeability ╬╝=B/H to vary continuously until saturation is reached.
Non-magnetic materials (vacuum/air) have a constant ╬╝rтАЛ=1.
Ferromagnetic materials exhibit saturation, causing the B/H ratio to decrease at high field intensities.
The B/H relationship for ferromagnetic materials is represented by the non-linear magnetization curve.
High permeability allows for efficient magnetic flux concentration
Essential for transformer cores and electric motors
Presence of hysteresis loss due to non-linear path
Saturation limits the maximum flux density in design
Transformer cores
Electromagnets
Inductor cores
Diamagnetic and paramagnetic materials have a nearly constant ╬╝rтАЛ, typically very close to 1.
The B-H curve for ferromagnetic materials is characteristically S-shaped (sigmoid) until saturation.
C is correct тАФ Ferromagnetic materials exhibit a non-linear B-H relationship due to domain orientation and magnetic saturation, making the B/H ratio variable.
Remember that constant permeability is a trait of linear materials; ferromagnetic materials are intrinsically non-linear and are defined by their B-H curves.